One of the best investments I made in 2015 was in Danny Rubin's book Wait, How Do I Write This Email? Although I've well missed the cutoff to be considered a millennial, the generation of Rubin's target audience, I am still young at heart. And this book is chock-full of invaluable templates for professionals of any age and stage. Months into 2016, I am still regularly turning to it for assistance in crafting nearly every business correspondence.

Believing that great writing skills can be the key to career success for many, Rubin has spent several years teaching millennials the power of strong writing and networking skills through workshops and his blog, News To Live By. Additionally, his first book, 25 Things Every Young Professional Should Know by Age 25, provides a comprehensive list of leadership skills and tips every millennial should know to be successful in the business world. He is, in my opinion, a communications champion and guardian of the written word for this generation.

For the rest of us who can only visualize twentysomething from our rearview mirrors when we squint, Rubin's lessons are still very applicable. In more than 200 pages, Wait, How Do I Write This Email? covers writing emails, business letters, resumes, and so much more.